From 148ede7f0f42f0ccb1620b13d91f35d0c7d04c2f Mon Sep 17 00:00:00 2001
From: Titus Wormer <tituswormer@gmail.com>
Date: Fri, 29 Jul 2022 10:49:07 +0200
Subject: Refactor to work on bytes (`u8`)

---
 src/construct/partial_bom.rs | 54 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 54 insertions(+)
 create mode 100644 src/construct/partial_bom.rs

(limited to 'src/construct/partial_bom.rs')

diff --git a/src/construct/partial_bom.rs b/src/construct/partial_bom.rs
new file mode 100644
index 0000000..be8d6c8
--- /dev/null
+++ b/src/construct/partial_bom.rs
@@ -0,0 +1,54 @@
+//! To do.
+
+use crate::token::Token;
+use crate::tokenizer::{State, Tokenizer};
+
+/// Before a BOM.
+///
+/// ```text
+/// > | 0xEF 0xBB 0xBF
+///     ^^^^
+/// ```
+pub fn start(tokenizer: &mut Tokenizer) -> State {
+    match tokenizer.current {
+        Some(0xEF) => {
+            tokenizer.enter(Token::ByteOrderMark);
+            tokenizer.consume();
+            State::Fn(Box::new(cont))
+        }
+        _ => State::Nok,
+    }
+}
+
+/// Second byte in BOM.
+///
+/// ```text
+/// > | 0xEF 0xBB 0xBF
+///          ^^^^
+/// ```
+fn cont(tokenizer: &mut Tokenizer) -> State {
+    match tokenizer.current {
+        Some(0xBB) => {
+            tokenizer.consume();
+            State::Fn(Box::new(end))
+        }
+        _ => State::Nok,
+    }
+}
+
+/// Last byte in BOM.
+///
+/// ```text
+/// > | 0xEF 0xBB 0xBF
+///               ^^^^
+/// ```
+fn end(tokenizer: &mut Tokenizer) -> State {
+    match tokenizer.current {
+        Some(0xBF) => {
+            tokenizer.consume();
+            tokenizer.exit(Token::ByteOrderMark);
+            State::Ok
+        }
+        _ => State::Nok,
+    }
+}
-- 
cgit